A vulnerability has been identified in Microsoft Windows, which could be exploited by attackers to bypass security restrictions. This issue is caused by an error in the Secure Channel (SChannel) authentication component that does not apply sufficient validation of certain Transport Layer Security (TLS) handshake messages to ensure that the client does in fact have access to the private key linked to the certificate used for authentication, which could allow attackers to authenticate to a server using only an authorized user's digital certificate and without the associated private key.
Credits Vulnerabilities reported by Secretaria da Fazenda do Estado do Rio Grande do Sul and Cia de Processamento de Dados do Estado do Rio Grande do Sul.
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